我正在编写我的第一个，当然是业余的，android 项目。目前我正在 viewpager 类中创建按钮，但我达到了在 instantiateItem 内添加代码、任何代码都会导致 viewpager 失败的地步。即使是不做任何事情的代码，例如：
int a = 1;
只要它似乎是关键行号就会导致崩溃。整个程序运行良好，然后我在 instantiateItem 中的任何位置添加一行任何代码，然后它崩溃了。Android 构建目标是 4.0，min sdk 是 14。模拟器和我的 Galaxy nexus 手机都发生崩溃。viewpager 内的代码总长度为 1000 行，包括注释和空格，删除后的代码约为 850 行。
确切的错误：
VFY：0x9c6[1] 处的无效切换目标 26 (-> 0x9e0)
VFY：在 0x9c6 拒绝操作码 0x2b
W/dalvikvm(8886): VFY: 拒绝 Lcharacter/sheet/CharacterViewer$MyPagerAdapter;.instantiateItem (Landroid/view/View;I)Ljava/lang/Object;
W/dalvikvm(8886)：验证程序拒绝类 Lcharacter/sheet/CharacterViewer$MyPagerAdapter；
W/dalvikvm(8886): threadid=1: 线程以未捕获的异常退出 (group=0x40a661f8)
E/AndroidRuntime(8886): java.lang.VerifyError: character/sheet/CharacterViewer$MyPagerAdapter
字符查看器活动的代码：
public class CharacterViewer extends Activity {
final DBAdapter db = new DBAdapter(this);
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pager);
Intent startCharacterViewer = getIntent();
final int activePagerPage = startCharacterViewer.getIntExtra("activePagerPage", 0);
MyPagerAdapter adapter = new MyPagerAdapter();
ViewPager myPager = (ViewPager) findViewById(R.id.myfivepanelpager);
myPager.setAdapter(adapter);
myPager.setCurrentItem(activePagerPage); }
private class MyPagerAdapter extends PagerAdapter {
Intent startCharacterViewer = getIntent();
final int activeCharacter = startCharacterViewer.getIntExtra("activeCharacter", 0);
public int getCount() {
return 5;
}
public Object instantiateItem(View collection, int position) {
db.open();
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
String name = db.getAttribute(activeCharacter, 1);
int level = Integer.valueOf(db.getAttribute(activeCharacter, 2));
//repeats for many variables (106 total)
db.close();
View v = null;
switch (position) {
//case 0
case 0:
v = inflater.inflate(R.layout.details, null);
break;
//case 1
case 1:
v = inflater.inflate(R.layout.features, null);
break;
//case 2
case 2:
v = inflater.inflate(R.layout.summary, null);
TextView text1 = (TextView) v.findViewById(R.id.textViewName);
text1.setText (name + " level " + level + " " + characterClass);
//repeats many times for more text views
//many many buttons and text views defined here
//case 3
case 3:
v = inflater.inflate(R.layout.skills, null);
//more text views and buttons defined here
case 4:
v = inflater.inflate(R.layout.inventory, null);
break;
}
((ViewPager) collection).addView(v, 0);
return v;
}
按钮和文本视图集代码嵌套在 instantiateItem 的 case 区域内。按钮之一的示例：
TextView hpUpdaterText1 = (TextView) v.findViewById(R.id.textViewHP);
TextView hpUpdaterText2 = (TextView) v.findViewById(R.id.textViewSurges);
final int a1 = hpMax;
final int b1 = hpSurgeMax;
View.OnClickListener hpModifierListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
final Dialog myDialog = new Dialog(CharacterViewer.this);
myDialog.setContentView(R.layout.edithitpoints);
myDialog.setTitle("Modify Permanent Health Values");
myDialog.setCancelable(true);
myDialog.show();
EditText text1 = (EditText) myDialog.findViewById(R.id.editTextHPMax);
text1.setText ("" + (a1));
EditText text2 = (EditText) myDialog.findViewById(R.id.editTextSurges);
text2.setText ("" + (b1));
//Cancel button
Button button1 = (Button) myDialog.findViewById(R.id.editHitPointsCancel);
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
myDialog.dismiss();
}});
//OK button
Button button2 = (Button) myDialog.findViewById(R.id.editHitPointsOK);
button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
EditText text1 = (EditText) myDialog.findViewById(R.id.editTextHPMax);
String a = text1.getText().toString();
if( a.length() == 0 ) {text1.setError( "Value Required" );}
EditText text2 = (EditText) myDialog.findViewById(R.id.editTextSurges);
String b = text2.getText().toString();
if( b.length() == 0 ) {text2.setError( "Value Required" );}
if (a.length() != 0 && b.length() != 0){
db.open();
db.updatePermanentHP(activeCharacter, a, b);
db.close();
//restart activity to update variables
Intent startCharacterViewer = new Intent("android.intent.action.SUMMARY");
startCharacterViewer.putExtra("activeCharacter", activeCharacter);
finish();
startCharacterViewer.putExtra("activePagerPage", 2);
startActivity(startCharacterViewer);
myDialog.dismiss();}
else {Toast msg = Toast.makeText(CharacterViewer.this,
"Please enter a value for" + "\n" + "all available fields", Toast.LENGTH_SHORT);
msg.show();;}
}});
}};
hpUpdaterText1.setOnClickListener(hpModifierListener);
hpUpdaterText2.setOnClickListener(hpModifierListener);
只要在 instantiateItem 内的任何地方添加任何代码行都会导致错误。例如，我可以将这段代码剪切并粘贴到 instantiateItem 中的任何位置，这会使程序崩溃。这些变量名不用于任何用途。
示例问题代码块：
int uuu = 1;
int aaa = 2;
int bbb = 3;
int ccc = 4;
int ddd = 5;
int eee = 6;